#!/bash/bin
s1_generate_a_series_of_files(){
for index in {1..100};do 
echo $index>/tmp/new_file$index;
done
}

s2_list_4_files_in_long_format_about_account_and_group(){
ls -l /etc/{passwd,shadow,group,gshadow} | sort -d
}

s3_find_items_related_to_given_username(){
grep -h $1 /etc/{passwd,shadow} | sort -d
}

s4_find_items_related_to_given_group_name(){
grep -h $1 /etc/{group,gshadow} | sort -d
}

s5_create_groups_for_given_group_names(){
groupadd rnd && groupadd itoperation
}

s6_create_users_and_set_their_group_as_required(){
useradd -G rnd adam && useradd -G rnd bob && useradd -G itoperation calvin && useradd -G itoperation david && useradd -G rnd edward
}

s7_change_users_shell(){
usermod -s /usr/bin/sh adam && usermod -s /usr/bin/sh edward
}

s8_set_password_change_policy(){
passwd -n 10 -x 60 -w 10 adam
passwd -n 10 -x 60 -w 10 bob
passwd -n 10 -x 60 -w 10 calvin
passwd -n 10 -x 60 -w 10 david
passwd -n 10 -x 60 -w 10 edward
}

s9_set_password_for_five_users(){
passwords=("$1" "$2" "$3" "$4" "$5")
username=("adam" "bob" "calvin" "david" "edward")
local chpass_input=""
for i in $(seq 0 4 );do
echo "${usernames[$i]}:!${passwords[$i]}" | sudo chpasswd
done
}

s10_lock_bobs_password(){
sudo usermod --lock bob
}

s11_include_adam_into_wheel_group(){
sudo usermod -aG wheel adam
}

s12_change_files_permission(){
for index in $(seq 3 3 99);do
sudo chmod 640 /tmp/new_file$index
done
}

















